Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
VideoScribe - Make your own whiteboard video animations with Sparkol VideoScribe – award-winning video scribing app for PC, Mac and iPad. Free trial available.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Doodly - Create your own doodle video in just 60 seconds
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
TTS Sketch Maker - Create amazing whiteboard sketch videos with text-to-speech human-sounding voices in minutes!